patch 8.2.0533: tests using term_wait() can still be flaky

Problem:    Tests using term_wait() can still be flaky.
Solution:   Increase the wait time when rerunning a test. (James McCoy,
            closes #5899)  Halve the initial times to make tests run faster
            when there is no rerun.
diff --git a/src/testdir/test_arglist.vim b/src/testdir/test_arglist.vim
index d73a3cc..aa81b57 100644
--- a/src/testdir/test_arglist.vim
+++ b/src/testdir/test_arglist.vim
@@ -518,7 +518,7 @@
   call term_sendkeys(buf, ":set nomore\n")
   call term_sendkeys(buf, ":args a b c\n")
   call term_sendkeys(buf, ":quit\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^E173:', term_getline(buf, 6))})
   call StopVimInTerminal(buf)
 
@@ -527,16 +527,16 @@
   call term_sendkeys(buf, ":set nomore\n")
   call term_sendkeys(buf, ":args a b c\n")
   call term_sendkeys(buf, ":confirm quit\n")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_match('^\[Y\]es, (N)o: *$',
         \ term_getline(buf, 6))})
   call term_sendkeys(buf, "N")
-  call term_wait(buf)
+  call TermWait(buf)
   call term_sendkeys(buf, ":confirm quit\n")
   call WaitForAssert({-> assert_match('^\[Y\]es, (N)o: *$',
         \ term_getline(buf, 6))})
   call term_sendkeys(buf, "Y")
-  call term_wait(buf)
+  call TermWait(buf)
   call WaitForAssert({-> assert_equal("finished", term_getstatus(buf))})
   only!
   " When this test fails, swap files are left behind which breaks subsequent